Opening device for sheet-metal cans.



P. SGHOLZ.

OPENING DEVICE FOR SHEET METAL CANS.

APPLIGATION FILED DEC. 31, 1912.

1 078311,, Patented N0v.11,'1913.

Witnesses: Z Inventnr':

wk P. Schulz Attorney PAUL SCHOLZ, OF BERGEN, NORWAY.

OPENING DEVICE FOR SHEET-METAL CANS.

Specification of Letters Patent.

Patented Nov. 11, 1913.

Application filed December 31,1912. Serial No. 739,443..

ments in Opening Devices for Sheetrll/letal Cans, of which the followingisa specification.

Improvements in this respect have been i a long-felt want which, however no. one

has heretofore been able to satisfy in the case of boxes the body and cover of which are connected by folding, and especially Where the opening tongue is made integral with the cover and folded into the fold. In this kind of box the opening tongue is disposed on a straight portion of the folding rim of the generally rectangular box, namely on one of the short sides of the box equidistant between its corners, and from the root of the tongue divergent weakening lines pass inwardly on the cover, on which lines the material is torn on being coiled around the key.

The arrangement is preferably such that the corner in which the tongue is disposed forms a straight or flat portion at and near the fold while the box body otherwise follows the normal rounding of the corner.

The invention is illustrated by way of example in the accompanying drawings in which Figure 1 represents a top view of the box body; Fig. 2 a bottom view of the same box body and the corresponding cover assembled before the parts are folded together. F ig. 3 is a cross-section on the line II of Fig. 2, Fig. 4 represents a top view of the finished box in a closed state, and Fig. 5 a corresponding crosssection on the line ITII of Fig. 4, Fig. 6 is a perspective view of the same box, the tongue, however, being bent upwardly to show the peculiar shape or deformation, respectively, of the tongue corner.

The box body 1 is pressed to the usual shape, that is to say with straight side portions 2 and rounded corners 3. But a por tion of the rim edge 4:, in the corner where the tongue is disposed, is cut away so as to present a straight portion 5 as shown in Figs. 1 and 2. The cover, on the other hand, is pressed so that its bottom portion 18 (Figs. 3 and 5) is bounded at one corner by a straight or fiat portion 6, and beyond the latter the opening tongue 7 forms an extension of the folding rim 8 of the cover. @n assembling the. box body and covers a space Diisformed outside the portion 6 between the same and the wall of the box can ner (Figs. 2 and 3). But when both parts are-folded together in a folding machine in which the shaping ring guiding the folding rollers during their rotation (for instance the ring 5 in British Patent No. 885 of A. D. 1904) has in one of its corners a straight or flat portion corresponding to the portion 6, so that the fold 10 will lie in its finished state along a rectangle with three rounded corners and one straight or fiat corner as shown in Fig. 4, the side wall of the box body below the rim edge that is cut away at 5, will be forced inwardly toward the cover portion 6. Thus the corner will be deformed during the folding operation. It will be rounded at the bottom of the box body (Fig. 6) but straight or flat next to the rim edge, and the above mentioned space 9 will disappear altogether during the folding operation. To ob tain in such a corner a tight and perfect folding connection, the rim edge, as already mentioned, is cut away at 5. For if such were not the case, superfluous material would be produced in the corner and give rise to wrinkles and accordingly to leaking of the fold. If, on the other hand, the rim edge is cut away as shown in the drawing, there will be just so much material in the corner of the box body that is deformed during the folding operation, for the final rim, as at all other points of the fold. The weakening lines are suitably arranged as shown by the dotted lines 11 in Fig. 1, namely so that they will follow the fold 10 closely to the same at all points excepting the tongue corner. The portions 12, 13 of the material of the cover, which will remain after the opening of the box, are of so small dimensions that they will not in any way prevent the contents of the box from being conveniently removed.

The tongue 7 is suitably formed as shown in Fig. 2, and on both sides of its root are disposed, outside the line IIIIII, small projections 14 which on account of the su perfiuous material produced in the small bends (at 15 in Fig. 4.) will be forced some what together during the folding operation so that their inner edge 16 will be pushed a little inwardly beyond the edge 17 of the tongue in the fold thereby producing an extra tightening of the folding connection at this critical point in a similar manner as described in my earlier application Ser. No. 667,980.

Having now described my invention, What I claim as new and desire to secure by Letters Patent is:

1. A receptacle comprising a body portion having a flattened corner a closure therefor having a depressed central portion provided with a flattened surface at its corner contiguous to the flattened corner of said body, said closure also having a folding rim provided with a straight surface and with an opening tongue-forming extension at its flattened corner.

2. A receptacle comprising a body portion having a flattened corner, a closure therefor having a depressed central portion provided with a flattened surface at its corner contiguous to the flattened corner of said body, said closure also having an opening tongue-forming extension at its flattened corner, the depressed portion of said closure having weakening lines therein.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PAUL SCHOLZ.

Witnesses A. O. TITTMANN, M. ESPELID.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. 0. 

